Memory; Microprocessors - IBM eServer xSeries 455 Faq

Memory

DIMM installation
See the ServerProven
Web for a list of memory modules you can use with the xSeries 455 server.
Review the following guidelines before installing additional memory in the xSeries
455 server:
v The xSeries 455 server supports 512 MB, 1 GB, and 2 GB DIMMs, for a
v The xSeries 455 server comes with a minimum of two 512 MB DIMMs, installed
v When installing additional DIMMs, you must install two DIMMS at a time. Each
v When using memory mirroring, you must install two pairs of DIMMs at a time.
v You can replace a failed DIMM while the server is on, provided that you have
See the IBM Eserver xSeries 455 Option Installation Guide on the IBM xSeries
Documentation CD for complete memory-installation instructions.
POST reports incorrect amount of installed memory
Description: POST reports less memory than the amount of memory installed in
the server.
Solution: To correct or isolate the problem, complete the following procedures:
v Verify that the installed DIMMs are supported on the xSeries 455 server.
v Reseat the DIMMs and VRMs to make sure that they are correctly installed and
v Using the Configuration/Setup Utility program, make sure that the DIMM
v Make sure that the DIMM configuration of port 1 is identical to the DIMM

Microprocessors

Microprocessor installation and replacement requirements
Attention:
assembly, or other server components when you install additional microprocessors
or replace existing microprocessors, observe the following guidelines:
v The socket for the Itanium microprocessor has a locking mechanism that is very
®
maximum of 56 GB of system memory. The server supports 2.5 V, 184-pin,
PC2100, ECC DDR SDRAM, 133 MHZ DIMMs.
in slots 1 and 14.
DIMM in a pair must be of the same size and technology to ensure that the
server will operate correctly.
The four DIMMs in each set must be identical.
enabled memory mirroring and that you have installed all DIMMs in the sequence
to support memory mirroring.
fully seated in the connectors.
connectors are enabled.
configuration of port 2 before you enable memory mirroring. If the memory-port
configurations are not identical when you enable memory mirroring, the server
will disable the connectors associated with the unmatched DIMMS.
Related topics: "Microprocessors report soft corrected errors" on page 7.
To avoid irreparable damage to the microprocessor, processor-board
difficult to see when the microprocessor assembly is in place. Before you attempt
to seat a microprocessor in the socket, be sure to become familiar with the
list at http://www.ibm.com/pc/compat/ on the World Wide
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Chapter 2. Hints and tips